Yes, I have this problem in Vista, when locking my workstation. The option --opengl does help. But rendering of the selection (the rounded cornerd) is much better in Direct X! And Sublime Text looks much slower in OpenGL-mode... is this true?

But is it possible to fix this issue? So we can run Sublime Text in normal mode

I've sunk quite a bit of time investigating the black screen issue in the past, but it seems that under the right circumstance, the D3D device just gets wedged, and can't be reset, nor re-created. I expect I could recreate the entire window, although that's getting fairly extreme. I think the best option at this stage is to make OpenGL the default mode.

OpenGL selection rendering quality will be on-par with DirectX in the next beta. Speed-wise there shouldn't be much between them, although it's been a while since I've looked at the timings.